Method of making a broom assembly



5. TAMNY METHOD OF MAKING A BROOM ASSEMBLY arch 26, 1968 3 Sheets-Sheet l M fvvewroe.

.75MNP Original Filed April 11, 1966 26, 1968 I S.TAMNY 3,375,041

METHOD OF MAKING A BROOM ASSEMBLY Original Filed April 11, 1966 3 Sheets-Sheet 5 United States Patent Patent No. 3,340,558, dated Sept. 1-2, 1967. Divided and this application July 3, 1967, Ser.

A No. 652,995v 7 Claims. '(Cl. 30021) ABSTRACT OF THE DISCLOSURE The invention provides for the simple and low cost The present application is a division of my copending application Ser. No. 541,552 filed :Apr. 11," 1966, on Disposable Broom Assembly, issued to Patent No. 3,340,558 dated Sept. 12, 1967.

This invention presents new developments in power driven sweeper brooms of generally cylindrical configuration and comprising bristles mounted to a core or drum structure. As in the case of prevalent broom structures of this type, the invention provides the bristles in the form of so-called brush strips mounted to a core or drum, but otherwise departs from the conventional.

Heretofore the construction of such brooms has been I modation within the slotted shell?v predicated significantly upon the provision of core structures designed for pennanency,an'd the replaceability from time to time of brush strips as the. bristles become worn. Involved therefore have been relatively expensive core construction, and various inconveniences and expenses necessitated by the brush strip replacements.

The invention has for its general object to provide a new brush construction which because of its initial low cost and simplicity, becomes economically andpractically disposable as a core and brushstrip assembly when the bristles become worn.

Further contemplated are new mounting and drive features in conjunction with the core proper, that reduce to quick simplicity the broom replacement.

Generally, these objectives are accomplished by formation of a sheet metal core shell in a manner permitting of simple and direct slotting and shaping operations, provision for easy insertion and retention of the brush strips, and the use of mounting and drive parts capable of formation economically as sheet metal stampings.

structurally, the invention provides for the shell formation by the simple and direct process of slotting sheet metal in distended form, then rolling the slotted metal to cylindrical configuration, and as an important feature, deforming the ends of the sheet to form flanges as integral continuations of the sheet so that the shell with its flanges are produceable from the same sheet stock. The slots are formed to extend continuously between the flanges, thus to accommodate brush strips correspondingly accommodated to the full length of the shell and retained between the flanges. This becomes the disposable broom.

For convenient support and drive of the shell, I have devised inserts received within the shell ends and so associated therewith as to be capable of receiving and driving against the brush strips while frictionally engaged against the shell, thus to be easily insertable and removable.

The invention has various additional features and objects, all of which together with the details of an illustra: tive embodiment-will be understood from the following description of the accompanying drawing, in which;

FIG. 1 is a view showing in perspective the broom core shell as formed after rolling;

FIG. 1A is a fragmentary viewshowing a variational form of the shell formation; 1 v 1 FIG. 2 isan enlarged end view showing the brush strips inserted into the shell; FIG. 3 is an enlarged showing of=thebrushstrip'accom- FIG. 4 is a view showing in longitudinal cross section the disposable broom as mounted on adriving shaft with driving means releasably associated with the shelf;

FIG. 5 is an enlarged fragmentary section showing the shell driving insert; I

:FIG. 6 shows in elevation the insert as withdrawn from; the-shell;

FIG. 7 is an enlarged cross section taken on broken-line 7-+7ofFIG.4;

.FIG. 8 is. a view illustrative of slotted sheet'stock from which the shell is rolled; and: I

' FIG. 9-is a fragmentary enlargedsection on line 9-9 ofFIG.8.

' In reference first to FIG.=4, in. the use environment of accommodation within a power sweeper, the disposable broom structure generally indicated at 10 and as detailed in FIG. 2, is mounted on shaft 11, one end of-which is driven as by sheave 12 on sleeve 13 splined to or welded at 14 to the shaft, the sleeve being journaled within bearing 15 and the shaft having driving relation with the later described driving head 17 and insert structure 18. At its opposite end the shaft carries a removable sleeve 20 journaled within bearing 22, the sleeve carrying insert plate structure 18a which may correspond to the insert 18 at the opposite end of the shell. The sleeve is retained within and shouldered to bearing 22 by nut 222 which tightens against washer 223. a

In considering the core shell and its method-of formae tion, reference is-i' had to FIG. 8 which shows sheet metal stock v23: which may be slotted at 24 in distended or flattened condition, the slots having such angularity that when the sheet is cylindrically rolled, the slots will have helical pitch as.. illustrated in FIG. 1. Broken lines 25 are indicative of end flange widths 26 of the sheet into which the slot terminals extend. The shell is cylindrically formed by rolling the slotted sheet and deflecting its ends to form the flanges 26 as they appear in FIG. 1, the flange-forming deflection of the metal being illustrated in FIG. '9. After the shell is thus rolled and flanged, the ends of the space 27 between opposed edges of the metal are suitably closed as by welded strips 28, see FIGS. 2 and 7.

In the manufacture of larger diameter cores it may be more advantageous to make the shells preformed sections and joining them together to cylindrical form. Thus as illustrated in FIG. 1A instead of forming the shell of a single sheet as described with reference to FIG. 1, I may construct the shell of preformed sections 23a each having two or more brush strip receiving slots 24a with flanged terminals 26a, the sections being joined together along overlapping edges as by bolts or rivets 23b. The segments 23a may be initially formed and joined in the fiat and thereafter rolled to the cylindrical shape of the shell, or the segments may initially be rolled as cylindrical segments and then joined together as indicated.

After formation of the shell, brush strips, generally indicated at 30 are inserted into the slots 24, each strip comprising an elongated metallic bristle holder 31 of generally omega shape within which is received the doubled ends of the brush bristles 32 which are retained in a usual manner by wire 33 about which the bristles are Patented Mar. 26, 1968 p 3 I doubledsEachholder has lateral flanges 34 which are welded to'the outer surfaces of the shell-23.- It will be ob- 4 served in reference to FIG. 4 that the brush strip holders 31 extend into the ends of the slots 24 within the flange bends, thus affording maximum brush or brush .strip length in relation to the axial dimension of the shell.

The described shell and brush strip assembly constitutes a brush structure for disposal as against reuse, after the bristles have become Worn, such disposability being both practical and economical as compared with for example replacement of brush strips in a retained core, by reason of low manufacturing and assembly costs made possible by the simple sheet metal core configurations and the ease of accommodating the brush strips within the core.

' The shell 23 is supported-at both ends from the shaft 11 by way of the pair of inserts 18 and 18a which comprise inner plate structure 36 and 36a welded to outer cavitated plates 37 and 37a peripherally bearing against the shell flanges 26, the plates being centrally apertured at'38 to pass the shaft 11. As illustrated in FIG. 6, plates 36 and 36a have uniformly circularly spaced flange segments forming resilient tongues 39 which may correspond in number to twice the number of brush strips. These tongues angle outwardly to an edge diameter such that when thrust into the end of the shell 23, the tongues will deflect inwardly and their abrupt or sharp edges frictionally engage the inner surface of theshell. As shown in FIG. 7, alternate spaces 40 between the tongues receive tions 43 of plate 37 thus to transmit the rotative head drive and brush support by simple surface inter-engagethe ends of the brush strip holders 31 so that rotating I drive by the plates 36 and 36a is transmitted to the disposable broom structure by engagement of the tongues 39 against both the brush strip holders and the inner surface of the shell 23.

Referring to FIG. 7, the cavitated plate 37 is polygonally recessed, e.g. hexagonally (as may also be plate 37a), to present about its central area 42 inwardly deflected planar portions 43 for releasable driving engage ment by the driving head 17. At this point it may be mentioned that plates 36, 36a and 37, 37a all may be formed simply and economically as sheet metal stampings.

The illustrated type of end drive for the shell is more particularly dealt with in a co-pending application Ser.

No. 430,317 filed Feb. 4, 1965, and assigned to the assignee of the present application. For present purposes it will suffice to describe the driving head 17 as comprising a cavitated plate 44 welded at 45 to the shaft 11. The cavitated shape of plate 44 corresponds to the shape of plate 37 as previously described with reference to FIG. 7, so that when brought together the angular portions 47 of plate 44 bear flatly against the corresponding deflecment of the parts.

Thus under use conditions the driving head 17 is interengaged With the insert assemblies 18 as shown in FIG. 4. When worn, the shell and bristle assembly constituting the brush proper, may be dismounted by first removing bearing 22 from sleeve 20 and withdrawing the sleeve and attached plates 36a and 37a from the shaft, thus freeing the shell 23 to be withdrawn from plate 36 remaining on the shaft, and from the shaft. A replacement brush is then mountable by a reverse sequence of these simple operations.

I claim:

1. The method of forming an essentially cylindrical sweeper broom structure that includes perforating metallic sheet material in essentially flattened condition to form spaced slots adapted to receive brush strips, rolling the slotted sheet material and securing it in cylindrical form at a shell with said slots extending longitudinally thereof, and deflecting the sheet metal at the ends of said slots to form outwardly projecting circular flanges.

2. The method of claim 1, in which the flange forming metal is deflected simultaneously with rolling of said sheet to form the shell.

3. The method of claim 1, in which said flanges are formed with said slots extending through the bases of the flanges.

4. The method of claim 1, including the further step of interconnecting the arcuate terminals of said flanges to retain the shell in cylindrical form.

5. The method of claim 1, in which said slots are formed in uniformly spaced relation to have parallel helical angularities in the formed shell.

6. The method of claim 1, including the further step of inserting and retaining brush strip holders within said slots.

7. The method of claim 5, including'the further step of inserting and retaining brush strip holders within said slots.-

References Cited UNITED STATES PATENTS 1,949,665 3/1934 Sturgis 300-21 3,053,575 9/1962 Zeilstra 300-21 3,139,641 7/1964 Grogan et al. 300-21 XR WILLIAIVIYV. DYER, JR., Primary Examiner. G. Y. CUSTER, JR., Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,375,041 March 26, 1968 Simon Tamny It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:

Column 4, line 20, for "at" read as Signed and sealed this 22nd day of July 1969.

(SEAL) Attest:

Edward M. Fletcher, Jr.

Attesting Officer Commissioner of Patents WILLIAM E. SCHUYLER, JR. 

